

package gulimall.utils;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.http.HttpStatus;

import java.util.HashMap;
import java.util.Map;

/**
 * 返回数据
 *
 */
public class R extends HashMap<String, Object> {
    private static final long serialVersionUID = 1L;

    /**
     * @param key
     * @param typeReference
     * @param <T>
     * @return 返回泛型对象 List集合等
     */
    public <T> T get(String key, TypeReference<T> typeReference) {
        Object o = this.get(key);
        ObjectMapper mapper = new ObjectMapper();
        T t = null;
        try {
            String s = mapper.writeValueAsString(o);
            t = mapper.readValue(s, typeReference);
        } catch (JsonProcessingException e) {
            throw new RuntimeException(e);
        }
        return t;
    }

    public R() {
        put("code", 0);
        put("msg", "success");
    }

    public static R error() {
        return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, "未知异常，请联系管理员");
    }

    public static R error(String msg) {
        return error(HttpStatus.SC_INTERNAL_SERVER_ERROR, msg);
    }

    public static R error(int code, String msg) {
        R r = new R();
        r.put("code", code);
        r.put("msg", msg);
        return r;
    }

    public static R ok(String msg) {
        R r = new R();
        r.put("msg", msg);
        return r;
    }

    public static R ok(Map<String, Object> map) {
        R r = new R();
        r.putAll(map);
        return r;
    }

    public static R ok() {
        return new R();
    }

    public R put(String key, Object value) {
        super.put(key, value);
        return this;
    }

    public Integer getCode() {
        return (Integer) this.get("code");
    }
}
